[csallen]

Having one primary source of revenue vs having more than one is not the same thing as having a monopoly vs not having one. A monopoly is about the number of serious competitors you have, not the number of revenue steams you support or innovations you create.

To wit: there are companies with only one product without monopolies (e.g. pretty much every startup ever), and companies that constantly invent new products and do have monopolies (e.g. pharmaceutical companies).

[staunch]

Of course it doesn't mean having one source of income. But in practice it looks that way. Certainly that's been the problem at Google, Microsoft, IBM, Oracle, etc. These companies came to rely on market domination instead of technology innovation, because their monopoly positions allowed them to.